[INTERNAL] sap.m.Carousel: Use "isA" to check for lazy dependencies
[INTERNAL] sap.m.Carousel: Use "isA" to check for lazy dependencies

As sap.m.Image is only a lazy dependency, it should be checked via "isA"
instead of using the global class or an AMD import.

The check for a sap.zen should also be done the same way, especially as
the library is not a dependency of sap.m.

Change-Id: Icd7bb4da2787c34bc817668f928ee8b33b498e35

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5